The trace does not include the whole call. We cannot even see how the call on port 51 (LineID 148) was started.

If port 51 is carrying the outgoing leg of a 2-line transferred call, then there would be no script running on that line (port 51), so in v7.4 you would not be able to jump to a new script by issuing Script_Goto command to the port carrying the outgoing leg of the tromboned transfer call.

Outgoing leg of a 2-line transferred call does not start any script on that outgoing port.

Various functionality to allow more complex control of the outgoing legs of the 2-line transfers (including starting scripts on those outgoing legs) are being gradually added to v7.5 onward, but such functionality was not supported under v7.4

In v7.4 and prior the Script_Goto is used to jump to a new script if there is already a script running on that line. It cannot be used to start scripts if no script is already running on that line..